Enhancement of thermal conductivity in magnetite based nanofluid due to chainlike structures

被引：359
作者：
Philip, John [1 ]
Shima, P. D. [1 ]
Raj, Baldev [1 ]
机构：
[1] Indira Gandhi Ctr Atom Res, Met & Mat Grp, Kalpakkam 603102, Tamil Nadu, India
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 20期
关键词：
D O I：
10.1063/1.2812699
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We observe a dramatic enhancement of thermal conductivity in a nanofluid containing magnetite particles of average diameter of 6.7 nm under the influence of an applied magnetic field. The maximum enhancement in the thermal conductivity observed is 300% (k/k(f)=4.0) at a particle loading of 6.3 vol %. The increase in thermal conductivity is attributed to the effective conduction of heat through the chainlike structures formed in the nanofluid. This finding is consistent with the theoretical prediction of enhanced thermal conductivity in nanofluid containing fractal aggregates. (c) 2007 American Institute of Physics.
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